<template>
  <div class="slide-show" @mouseover="clearInv" @mouseout="runInv">
    <div class="slide-img">
      <a :href="slides[nowIndex].href">
        <transition name="slide-trans">
          <img v-if="isShow" :src="slides[nowIndex].src">
        </transition>
        <transition name="slide-trans-old">
          <img v-if="!isShow" :src="slides[nowIndex].src">
        </transition>
      </a>
    </div>
    <h2>{{ slides[nowIndex].title }}</h2>
    <ul class="slide-pages">
      <li @click="goto(prevIndex)">&lt;</li>
      <li v-for="(item,index) in slides" @click="goto(index)">
        <a :class="{on:index===nowIndex}">{{index+1}}</a>
      </li>
      <li @click="goto(nextIndex)">&gt;</li>
    </ul>
  </div>
</template>

<script>
export default {
  props:{
    slides:{
      type:Array,
      default:[]
    },
    inv:{
      type:Number,
      default:1000
    }
  },
  data () {
    return {
      nowIndex:0,
      isShow:true
    }
  },
  computed: {
    prevIndex(){
      if(this.nowIndex===0){
        return this.slides.length-1
      }
      else {
        return this.nowIndex-1
      }
    },
    nextIndex(){
      if(this.nowIndex===this.slides.length-1){
        return 0
      }
      else {
        return this.nowIndex+1
      }
    }
  },
  methods: {
    goto (index) {
      this.isShow=false;
      setTimeout(() =>{
        this.isShow=true;
        this.nowIndex=index;
      },10)
    },
    runInv () {
      this.invId = setInterval(() =>{
        this.goto(this.nextIndex)
      },this.inv)
    },
    clearInv () {
      clearInterval(this.invId);
    }
  },
  mounted () {
    this.runInv()
  }




}
</script>

<style scoped>
  .slide-trans-enter-active {
    transition: all .5s;
  }
  .slide-trans-enter {
    transform: translateX(900px);
  }
  .slide-trans-old-leave-active {
    transition: all .5s;
    transform: translateX(-900px);
  }
  .slide-show {
    position: relative;
    margin: 15px 15px 15px 0;
    width: 900px;
    height: 500px;
    overflow: hidden;
  }
  .slide-show h2 {
    position: absolute;
    width: 100%;
    height: 100%;
    color: #fff;
    background: #000;
    opacity: .5;
    bottom: 0;
    height: 30px;
    text-align: left;
    padding-left: 15px;
  }
  .slide-img {
    width: 100%;
  }
  .slide-img img {
    width: 100%;
    position: absolute;
    top: 0;
  }
  .slide-pages {
    position: absolute;
    bottom: 10px;
    right: 15px;
  }
  .slide-pages li {
    display: inline-block;
    padding: 0 10px;
    cursor: pointer;
    color: #fff;
  }
  .slide-pages li .on {
    text-decoration: underline;
  }
</style>
